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Entanglement invariant for the double Jaynes-Cummings model
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.ORCID iD: 0000-0002-2082-9583
2007 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 76, no 4Article in journal (Refereed) Published
Abstract [en]

We study entanglement dynamics between four qubits interacting through two isolated Jaynes-Cummings Hamiltonians, via an entanglement measure based on the wedge product. We compare the results with similar results obtained using bipartite concurrence resulting in what is referred to as entanglement sudden death. We find a natural entanglement invariant under evolution, demonstrating that entanglement spreads out over all of the system's degrees of freedom that become entangled through the interaction. We also provide an analysis of why certain initial states lose all their entanglement in a finite time, although their excitation and coherence vanish only asymptotically with time.

Place, publisher, year, edition, pages
2007. Vol. 76, no 4
Keyword [en]
sudden-death, quantum, decoherence, dynamics, states, atoms
URN: urn:nbn:se:kth:diva-17088DOI: 10.1103/PhysRevA.76.042313ISI: 000250619700056ScopusID: 2-s2.0-35148889031OAI: diva2:335131
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Björk, Gunnar
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Microelectronics and Applied Physics, MAP
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